The reduced iron production manner which uses the blast furnace moisture dust and coarsely mixing another

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a reduced iron with which the collapse and the powdering of a pellet in the heating furnace is produced and the product reduced iron having high dezincificating rate and high metallizing rate can be produced at a high yield when the pellet containing wet dust of blast furnace is heated and reduced in the heating furnace to obtain the reduced iron.;SOLUTION: The additional ratio of the other powdery raw material containing iron oxide and/or carbon into the wet dust of the blast furnace, is adjusted and mixed raw material is prepared so that an excessive carbon rate SC satisfies the formula: Sc≤8-2NL+0.02YD. Wherein, SC=XC-(12/16)XO, NL: average number of layers of the pellet laid on the furnace hearth, YD =100XC'B/XC. Then, XC: mass% of carbon in the pellet, XO: total mass% of oxygen in the iron oxide and zinc oxide in the pellet, XC'B: mass% of carbon contained in the other powdery raw material in the pellet.;COPYRIGHT: (C)2004,JPO